Why the inner core remains a solid even though it is very hot? How the gap is fi

Question

Why the inner core remains a solid even though it is very hot? How the gap is filled when 2 tectonic plates move awayfrom each other? How magnetic bands provide evidence that tectonic plates aremoving apart at mid-oceanic ridges? What type of plate boundry exists along the coastline nearJapan's volcanic mountain ranges? The oldest continental rocks are 4 billion years old, where asthe oldest sea-floor rocks are 200 million years old. What is thedifference in these ages? How the gap is filled when 2 tectonic plates move awayfrom each other? How magnetic bands provide evidence that tectonic plates aremoving apart at mid-oceanic ridges? What type of plate boundry exists along the coastline nearJapan's volcanic mountain ranges? The oldest continental rocks are 4 billion years old, where asthe oldest sea-floor rocks are 200 million years old. What is thedifference in these ages?

Explanation / Answer

   1 ) For almost all materials, thesolid is denser than the liquid, because it is better packed, andhas less random thermal motion in it (gas is even less dense andmore random). The most familiar substance we know, water, is verystrange. It's solid is less dense, so ice floats on water(icebergs, pond ice, ice cubes in drinks etc). Just abouteverything else doesn't do this.

If you take a liquid that is near to its freezing point, and put itunder high pressure, you squeeze it into the solid state at atempreature where at normal pressure it would still be liquid. Soit is with the Earth's core The whole thing is close to theliquid/solid transition temperature. (No coincidence, either - seelater). The higher pressure near the middle means that the innercore is solid, and the outer core is liquid    2 ) When tectonic plates move away from eachother, the gap is filled from below by volcanic material I hope it helps you

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